AberSim makes use of the Motorola as11 assembler
and the sim68xx simulator to provide a graphical
integrated development and simulation environment
for the 68HC11 processor. It is designed to be
simple for additional simulated hardware to be
created.

AdvanceCD is a bootable live CD, DVD, and USB disk
that contains a minimal Linux distribution
containing the AdvanceMAME emulator. You can boot
it on any PC and play the contained games without
any installation.

AdvanceMENU is a frontend for AdvanceMAME,
MAME, MESS, RAINE and other arcade emulators. It
supports extended features like PNG/MNG/MP3
animated snapshots, up to 192 previews at the
same time, and many other features.

Aliados is a CP/M 80 emulator. Instead of
emulating a machine and running some variant of
CP/M on it, it emulates only the microprocessor
and captures all CP/M system calls to execute
natively. It does not need to create disk images,
but reads and writes on the native filesystem all
files that match the CP/M naming conventions.

AmigaShell makes your shell look just like an Amiga commandline. It
won't run under X or over a remote shell. It has been tested
successfully on i386 (textmode), Sparc (framebuffer), and PowerPC
machines running Debian GNU/Linux.

ADTPro transfers disks to and from Apple II and Apple /// computers and the modern world using any of these communications methods: serial/USB, UDP via the Uthernet or LANceGS Ethernet cards, or audio via the Apple's cassette ports. ADTPro has comprehensive bootstrapping support for otherwise diskless Apple IIs. The home page includes extensive tutorials for getting started.